Automotive

Headlight Warning Buzzer

Often,we find that a lot of motorist.They have forgotten to turn on light in a car when parking.then back to start the machine,it did not work,because a battery did not have a energy. but this circuit will be warning a car driver for instantly know,when we forget to open the car door or forgetting to turn off lights in the car.
From this circuit picture,The transistor Q1 and Q2 are working to astable multivibrator circuit.The collector pin of the Q2 used a loudspeaker was a load’s circuit.The capacitors C1, C2 and a resistors R3, R4 was timing part’s circuit, and to set a frequency of output signal,
When turn on switch,then the current a flow to pass a diode D1 and a resistor R1. It were positive power supply’s this circuit,then the ZD1 6.2v zener diode use to voltage regulated at 9.1 volt of the power supply.
The ground wire is connected to the switch, cabin light, which is controlled by the door.The circuit is connected to ground only, when the door is opened only.
The ocean, off the switch to start and turn left. Then the driver opened the door enough. The Oscillator generator circuit will alarm,that forgot turn off the light.

Be the first to comment - What do you think? Posted by admin - April 4, 2011 at 8:13 am

Categories: Alarm systems, Automotive, Lighting Tags: car alarm circuit, Headlight Warning Buzzer

Lambda Probe Readout For Carburettor Tuning

A lambda probe (or oxygen sensor) can be found on the exhaust system of most cars running on unleaded fuel. Having reached its normal operating temperature (of about 600 degrees Celsius!) the lambda probe supplies an output voltage proportional to the amount of residual oxygen measured in the exhaust gas. This information is indicative of, among others, the air/fuel ratio supplied by the carburetor(s) and hence the combustion efficiency. In modern car (and motorcycle) engines, this information is used to (electronically) adjust engine parameters like ignition timing and fuel injection. The indicator described here is intended for permanent installation on a motorcycle of which the air/fuel ratio needed to be watched, with the obvious aim engine power tuning after ?tting a different set of carburetors.
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Be the first to comment - What do you think? Posted by admin - October 18, 2010 at 11:34 pm

Categories: Automotive, LED Flasher, Meter Tags: automotive oxygen sensor, car probe circuit, car tester circuit

Car Boot Lamp Warning by ICM7556

On many cars, the boot light will not go out until the lid is properly closed. It is all too easy when unloading the car, to leave the lid ajar. If you are unlucky and the car remains unused for some time, the next time you try to start it, the lamp will have drained the battery and you will no doubt utter a few appropriate words. The circuit described here will give a warning of just such a situation. A mercury tilt switch is mounted in the boot so that as the lid is closed, its contacts close before the lid is completely shut. The supply for the circuit comes from the switched 12 V to the boot lamp and through the mercury switch. When the lid is properly closed, the boot lamp will go out and the supply to the circuit will go to zero. If however the lid is left ajar, the lamp will be on and the mercury switch will close the circuit.

After 5 seconds, the alarm will start to sound, and unless the lid is shut, it will continue for 1 minute to remind you to close the boot properly. The 1-minute operating period will ensure that the alarm does not sound continuously if you are, for example, transporting bulky items and the boot will not fully close. The circuit consists of a dual CMOS timer type 7556 (the bipolar 556 version is unsuitable for this application). When power is applied to the circuit (i.e. the boot lid is ajar) tantalum capacitors C1 and C2 will ensure that the outputs of the timers are high. After approximately 5 seconds, when the voltage across C2 rises to 2/3 of the supply voltage, timer IC1b will be triggered and its output will go low thereby causing the alarm to sound.[...]